Автор: Ioannis Ntintakis
Статии
- TOOLPATH GENERATION AND OPTIMIZATION OF MACHINING OF PINE WOOD SURFACES
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Резюме
In this paper are presented methods for wood working milling machining, specially we are going to use samples of pine wood. In the beginning a sculpture surfaces will be designed in a CAD/CAM software Fusion 360 and tool paths will be generated using four different strategies for finishing stage, these are: a) parallel, b) scallop, c) radial and d) pencil. On the upper machining surface of the final physical parts we measure the roughness in order to check the produced quality for each strategy. Each strategy compared according the total machining time, the cutting conditions and the geometric accuracy. Physical models will be produced with the use of a rapid prototyping machine ROLAND MDX- 40A for evaluation and tool path comparison.
Ключови думи: CNC, wood machining, tool path, CAD/CAM, milling, optimization, pine wood
- DESIGN OF AN UXILIARY FURNITURE FOR PATIENTS IN REHABILITATION STAGE
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Резюме
Human spin is a complicate and sensitive body part. Every spine is as unique as a fingerprint. Every person has his own unique ‘spine print’, and that print changes as the person’s posture changes. Injuries in the spine can cause serious problems in a person's daily life. Sometimes the conservative treatment that is often applied is not enough, so surgical intervention is necessary. A serious kind of spine surgery is spinal fusion which is a surgical procedure used to correct problems with small bones in the spine (vertebrae). It is essentially a "welding" process. After this stage, the patient is undergoing rehabilitation, a stage that varies from person to person. The rehabilitation stage is temporary and it is very critical for patient’s recovery. During this phase the patient have to follow doctor guidelines in a very restrict program. In current research, auxiliary furniture is designed, aimed to improving the quality of people life in rehabilitation stage after a serious surgery of spinal fusion.
Ключови думи: furniture design, universal design, patients, spinal fusion, rehabilitation stage
- CHECK OF SURFACE ROUGHNESS AVERAGE OF WENGE & MAPLE MILLING SURFACES
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Резюме
Working in a CNC machines is one of the most popular woodworking processes. Often is more suitable to use Subtractive Rapid Prototyping (SRP) machines than classic CNC machines. In the current study the surface roughness checked for two different wood kinds, wenge and maple. For each kind of wood six specimens milling in a 3-axis SRP machine and then the surface roughness average (Ra) defined. During milling process two different tools used. For roughing phase, a square end mill and then a ball end mill for finishing. For roughness check a portable linear roughness tester instrument used to define the Roughness Average (Ra) for each specimen. During the milling process the spindle speed and fed rate varies. The spindle speed starts from 1.100 mm/min until to 2.400mm/min and feed rates starts from 9.00 rpm to 15.000 rpm. According to the results the changes in machining parameters have significant effect to surface quality. Wenge is harder than maple wood and that play an important role to surface roughness. As cutting parameters improved roughness average (Ra) is less.
Ключови думи: CAD/CAM, CNC Rapid Prototyping, Roughness Average (Ra)